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GRAPH-LOCK® 3125SS Flexible Graphite Gasketing

Laminated graphite sheet with a 3125SS foil insert

GRAPH-LOCK® 3125SS has laminated layers of 0.015" purified natural graphite flake that have been acid washed, expanded under heat and then compressed into sheets with a minimum graphite content of 98%. This sheet contains a 0.002” thick 316 stainless steel foil insert, bonded with a proprietary adhesive. This adhesive makes up less than 1% of the total laminated weight.


  • Excellent resistance
  • Pure exfoliated graphite flake material excels in extreme conditions, withstanding heat, pressure, and aggressive chemicals
  • Proven fire-safe
  • Reliable
  • Seals easily under moderate bolt load, offers superior torque retention
  • Retains dimensional stability in high temperatures; seals tightly even during pressure fluctuations


  • Available in sheet and cut gasket form
  • Min. Temperature:            -400°F      /      -240°C
  • Max. Temperature:            850°F      /      454°C
  • Max. Pressure:            2,000 PSI       /     138 bar
  • Maximum PxT 1/16:        700,000 (°F x PSIG)  /  25,000 bar x °C
  • Maximum PxT 1/8:            350,000 (°F x PSIG) /   12,000 bar x °C
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